[PD] change in compression detection

[Mathieu Bouchard]

On Mon, 10 Jan 2011, Roman Haefeli wrote:

> Assuming that the more compression is applied, the more the RMS 
> amplitude [1] approaches the Peak amplitude [2] of an audio signal,

Why do you assume that ? Let's say I take a signal and divide it by its 
recent peak volume. The output of [osc~] will stay unchanged. A signal 
made of plenty of sharp spikes will have a much lower RMS/peak ratio and 
still be unchanged.

Are you confusing this with waveshaping such as [expr tanh($v1)] ? It may 
be a special case of compression, but is not what is usually meant by 
that.

http://en.wikipedia.org/wiki/Dynamic_range_compression

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